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Loans and Allowance for Loan Losses - Internal Loan Grading by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 3,358,938	$ 3,242,427	$ 3,116,096
Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	459,346		481,700
Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	877,502		667,870
Residential real estate permanent mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	256,217		244,666
Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	551,150		493,132
Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	778,478		733,906
Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	224,495		207,743
Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	138,866		150,482
Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	72,884		136,597
Grade 1 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,866,273		2,709,926
Grade 1 [Member] | Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	388,923		420,426
Grade 1 [Member] | Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	714,670		564,180
Grade 1 [Member] | Residential real estate permanent mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	224,518		206,702
Grade 1 [Member] | Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	457,649		429,862
Grade 1 [Member] | Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	681,695		644,066
Grade 1 [Member] | Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	210,285		195,242
Grade 1 [Member] | Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	135,169		146,037
Grade 1 [Member] | Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	53,364		103,411
Grade 2 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	425,317		327,755
Grade 2 [Member] | Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	64,418		49,131
Grade 2 [Member] | Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	134,760		78,637
Grade 2 [Member] | Residential real estate permanent mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	25,091		31,558
Grade 2 [Member] | Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	82,827		50,412
Grade 2 [Member] | Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	91,108		80,863
Grade 2 [Member] | Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	11,760		10,185
Grade 2 [Member] | Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,646		2,726
Grade 2 [Member] | Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	12,707		24,243
Grade 3 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	51,967		56,548
Grade 3 [Member] | Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	5,189		6,189
Grade 3 [Member] | Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	21,237		21,334
Grade 3 [Member] | Residential real estate permanent mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	5,574		5,547
Grade 3 [Member] | Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	8,721		9,120
Grade 3 [Member] | Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	4,254		6,500
Grade 3 [Member] | Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,047		1,965
Grade 3 [Member] | Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	738		887
Grade 3 [Member] | Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	4,207		5,006
Grade 4 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	15,381		21,826
Grade 4 [Member] | Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	816		5,954
Grade 4 [Member] | Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,835		3,719
Grade 4 [Member] | Residential real estate permanent mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,034		859
Grade 4 [Member] | Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,953		3,738
Grade 4 [Member] | Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,421		2,477
Grade 4 [Member] | Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	403		349
Grade 4 [Member] | Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	313		832
Grade 4 [Member] | Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,606		3,898
Grade 5 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans			41
Grade 5 [Member] | Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans
Grade 5 [Member] | Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans
Grade 5 [Member] | Residential real estate permanent mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans
Grade 5 [Member] | Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans
Grade 5 [Member] | Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans
Grade 5 [Member] | Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans			2
Grade 5 [Member] | Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans
Grade 5 [Member] | Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans			$ 39

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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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